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36:6+4*2*5-(20-13:3)

Răspuns :

36:6+4*2*5-(20-13:3)=
=36:6+4*2*5-(20-5)=
=36:6+4*2*5-15=
=36:6+8*5-15=
=36:6+40-15=
=6+40-15=
=6+25=
=31